首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
In science, a theory is a reasonable explanation of observed events that are related. A theory often involves an imaginary model
In science, a theory is a reasonable explanation of observed events that are related. A theory often involves an imaginary model
admin
2017-06-11
101
问题
In science, a theory is a reasonable explanation of observed events that are related. A theory often involves an imaginary model that helps scientists picture the way an observed event could be produced. A good example of this is found in the kinetic molecular theory, in which gases are pictured as being made up of many small particles that are in constant motion.
A useful theory, in addition to explaining past observations, helps to predict events that have not as yet been observed. After a theory has been publicized, scientists design experiments to test the theory. If observations confirm the scientists’ predictions, the theory is supported. If observations do not confirm the predictions, the scientists must search further. There may be a fault in the experiment, or the theory may have to be revised or rejected.
Science involves imagination and creative thinking as well as collecting information and performing experiments. Facts by themselves are not science. As the mathematician Jules Henri Poincare said; " Science is built with facts just as a house is built with bricks, but a collection of facts cannot be called science any more than a pile of bricks can be called a house. " Most scientists start an investigation by finding out what other scientists have learned about a particular problem. After known facts have been gathered, the scientist comes to the part of the investigation that requires considerable imagination. Possible solutions to the problem are formulated. These possible solutions are called hypotheses.
In a way, any hypothesis is a leap into the unknown. It extends the scientist’s thinking beyond the known facts. The scientist plans experiments, performs calculations, and makes observations to test hypotheses. For without hypotheses, further investigation lacks purpose and direction. When hypotheses are confirmed, they are incorporated into theories.
The word "this" in the 3rd sentence in paragraph 1 refers to______.
选项
A、a good example
B、an imaginary model
C、the kinetic molecular theory
D、an observed event
答案
B
解析
本题是指代题。第三句话中的代词this指代前一句提到的an imaginary model。引用这个例子的目的在于在动力分子理论中,气体被描绘成由许多不停运动的小分子所组成,即前句中“A theory often involves an imaginary model that helps scientists picture the wayan observed event could be produced”(理论常包含一个虚构的模式来帮助科学家描述事物的出现过程。)
转载请注明原文地址:https://kaotiyun.com/show/zkFO777K
0
考博英语
相关试题推荐
Engineeringstudentsaresupposedtobeexamplesofpracticalityandrationality,butwhenitcomestomycollegeeducationIam
Restrictionsontheuseofplasticbagshavenotbeensosuccessfulinsomeregions."Whitepollution"isstillgoingon.Write
Evengeologistisfamiliarwiththeerosioncycle.Nosoonerhasanareaoflandbeenraisedabovesea-levelthanitbecomessub
Onanaverageofsixtimesaday,adoctorinHollandpractices"active"euthanasiaintentionallyadministeringalethaldrugto
Readthefollowingpassagecarefullyandthenparaphrasethenumberedandunderlinedparts.("Paraphrase"means"toexplainthem
Oneofthemajordifferencesbetweenmanandhisclosestlivingrelativeis,ofcourse,thatthechimpanzeehasnotdevelopedthe
Oneofthemajordifferencesbetweenmanandhisclosestlivingrelativeis,ofcourse,thatthechimpanzeehasnotdevelopedthe
Whenyouaresmall,allambitionsfallintoonegrandcategory:whenI’mgrownup.WhenI’mgrownup,yousay,I’llgoupinspace.
Whenyouaresmall,allambitionsfallintoonegrandcategory:whenI’mgrownup.WhenI’mgrownup,yousay,I’llgoupinspace.
Humanbeingisaproductoftheconsecutivelyevolutionalprocesswhichinvolvescountlesstimesofgenetictransformation.Thei
随机试题
液化氯化石蜡的含氯量在()左右,可作橡胶、纤维蜡、乙烯类树脂的增韧剂。
常用的尖口角钳有()种规格。
在Excel2010中,公式“3.14*$C$4”中对C4单元格进行了()
纤维增生型慢性牙龈炎的病理改变不包括
医疗机构应当对其医务人员进行的教育不包括
下列选项中,不属于我国预算收入中的专项收人的是()。
根据《合同法》规定,当事人订立合同,采取()方式。
班主任在组织班级教育力量中所起的作用是()。
教育史上提出“有教无类”口号的教育家是()。
在一行上写多条语句时,应使用的分隔符是()。
最新回复
(
0
)